The first release of the service aims to offer flight booking capability as well as hotel, rail and car-hire in half the time it would traditionally take to book just the flight.

这项服务的首次发布提供了机票及酒店、铁路、汽车租赁预订功能，将使用该功能预订以上产品需要的时间缩短到只是预订机票产品用时的一半。

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So, the half-life is just the time that it takes for half of the reactants to disappear.

半衰期实际上是,一半反应物消失的时间。

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"This looks half dead most of the time, perhaps with just one branch that appears to be alive," says Sussman. "it shuts down all its non-essential processes."

“这种树大部分时间看起来都是半死不活的，有时仅仅是一个枝条表明这树还活着”萨斯曼说：“它是停止了所有不必要的生命活动。”

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Fulham always looked the more threatening going forward though and it was no surprise when Zamora made it 2-0 just before half time, collecting a backheel from David Elm and firing in at an angle from 18 yards.

BBC: Fulham 4-0 Notts County

But just as it seemed Palace would reach half-time unscathed, they fell behind to a goal uncannily similar to Petrov's leveller in south London 10 days ago.

BBC: Aston Villa 3-1 Crystal Palace

It was the German's first goal since his strike dumped Scolari's Portugal out of the 2008 World Cup at the quarter-final stage in June - evidence if it was needed of just how out of sorts he has been this season - but it was just the fillip Chelsea were after before half-time.

BBC: Southend 1-4 Chelsea